(Buyouts Insider) Private equity professionals who thought they had cybersecurity risks under control may be in for a jolt after this week’s release of the summer 2015 edition of Connections in the Middle Market, produced in partnership by law firm Duane Morris LLP and private equity publisher Buyouts Insider.

The cover story reveals how one mid-market buyout shop has already had to contend with breaches at two portfolio companies, including one where hackers threatened to expose sensitive customer information if they weren’t paid a sizeable ransom.

The story goes on to provide private equity professionals with actionable advice on how they can protect sensitive information—including the financial results of privately-held portfolio companies—from hackers and related cyber attacks. A list of “Top 11 tips to harden your cyber defenses” includes such advice as making sure to perform a self-assessment identifying gaps in cyber defenses, to formulate an incident response plan in the event of a breach, and to consider buying a cybersecurity insurance policy.